#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int My_strlen(char* arr)
{
	char* start = arr,* end=0;
	while (*arr)
	{
		arr += 1;
	}
	end = arr;
	return end - start;
}
int main()
{
	char arr[] = { "hello" };
	int count = My_strlen(arr);
	printf("count=%d\n", count);
	return 0;
}